Who this is for — Readers who want to understand where an order ends up, why a broker may choose among several destinations and why “exchange-listed” does not mean that every order executes on the listing exchange.
Routing is the process through which an intermediary directs an order to a possible execution destination. A venue is the regulated or contractual environment in which the order may meet a counterparty. Broker, router, venue, counterparty, clearing house and custodian are distinct roles, even when some belong to the same corporate group.
There is no single global list of venues. Legal categories vary by jurisdiction and product: the European Union's MiFID II definitions must not be overlaid on the structure of US equities, and neither framework automatically describes foreign exchange, futures or crypto-assets in every country.
From client to destination
The essential path includes:
- the client submits the order to the broker;
- the broker applies controls and interprets the instructions;
- the router selects a destination or a sequence of destinations;
- the venue accepts or rejects the order under its own rules;
- matching or a dealer produces one or more fills;
- the executed quantities enter post-trade processing.
A trading app therefore does not ordinarily represent a direct, intermediary-free connection to the entire market. The SEC reminds US investors that the broker decides where to send many orders and that time, quoted quantity and price movements may alter the outcome before execution.
An order may specify a permitted destination or leave the broker discretion. It may also be further routable if its type and the applicable rules allow it. “Smart order router” describes a function, not a guarantee.
The European Union perimeter
MiFID II defines trading venue as a category that includes:
| Category | Essential regulatory description |
|---|---|
| Regulated market | multilateral system operated by a market operator and authorised under the relevant MiFID II title |
| MTF | multilateral system operated by an investment firm or market operator under non-discretionary rules |
| OTF | multilateral system, other than a regulated market or MTF, for bonds, structured finance products, emission allowances or derivatives |
A “regulated market” is therefore one category, not a synonym for every venue. Article 27 also contemplates an execution policy that permits execution outside a trading venue and requires the disclosure and express consent specified by the rule.
EU best execution does not require selecting the nominally lowest or highest price in every case. The firm must consider price, costs, speed, likelihood of execution and settlement, size, nature and other relevant factors. For a retail client, total consideration is particularly important and includes the price and costs directly related to execution.
The US equity perimeter
Investor.gov describes several possible destinations: the listing exchange or another exchange, a market maker, an OTC market maker, an electronic communications network and internalisation through the firm's own inventory. These are illustrative categories for the US market, not one-to-one equivalents of European regulated markets, MTFs and OTFs.
In fragmented markets, liquidity may be found in different locations. The quote displayed represents a particular quantity at a particular moment: it may change in transit and may not cover the full requested size.
SEC Rule 606 requires, within its scope, disclosure about order routing. Aggregated public reports and information available to the client help reveal destinations and economic arrangements, but they do not replace analysis of individual fills and execution quality.
Factors that may guide routing
| Factor | The right question |
|---|---|
| Price | which quotes were genuinely accessible for that size? |
| Costs | do commissions, venue fees and other charges change the total result? |
| Likelihood | does the destination offer compatible quantity and conditions? |
| Speed | does the required delay change price risk? |
| Size and nature | does the order require splitting, discretion or dedicated handling? |
| Post-trade | do clearing and settlement affect cost and likelihood of completion? |
The router may split a quantity among several venues or send it sequentially. This can produce partial fills, different prices and distinct timestamps. The average price must be weighted by quantity; the best price displayed before submission is not a promise for the entire size.
Internalisation, PFOF and conflicts
With internalisation, the order may be executed within the firm under the applicable model. In the US market, some operators pay a broker for its flow, a practice called payment for order flow. The economic relationship should be assessed alongside price, effective spread, speed and likelihood of a fill.
Rule 606 requires the description of certain arrangements and routing reports within the NMS perimeter. In the EU, the MiFID II framework, the execution policy and the applicable conflict rules apply. The legality or quality of a practice in one country must not be inferred from terminology used in another.
Venue, OTC and post-trade infrastructure
“OTC” does not automatically mean manual, rule-free or uncleared. It describes an execution perimeter that must be defined under the relevant law and for the particular instrument. An OTC transaction may use electronic systems and, in some markets, be subject to reporting or clearing obligations.
The venue is not the central counterparty. A CCP may interpose itself after execution; a central securities depository and a custodian perform additional functions. Knowing the venue is therefore not enough to establish who bears counterparty risk or where the asset will be recorded.
Common mistakes — Calling every app an “exchange”; confusing a broker with a venue; assuming that the listing exchange receives every order; using “OTC” as a synonym for unregulated; evaluating routing only by the displayed price while ignoring size, costs and likelihood of execution.
Practical verification of the path
Before and after the transaction, identify the broker, execution policy, any direct-routing option, venue or dealer for each fill, quantities and prices for every execution, commissions and remainder. For US equities, consult the relevant Rule 606 information; for EU services, consult the MiFID II policy and disclosures. A dispute requires the order report and timestamps, not only a screenshot of the chart.
Sources
- U.S. Securities and Exchange Commission, Investor.gov, Executing an Order — destinations, internalisation, PFOF and best execution in the US equity context.
- U.S. Securities and Exchange Commission, Responses to Frequently Asked Questions Concerning Rule 606 of Regulation NMS — routing disclosure, broker discretion and further routable orders within the rule's perimeter.
- European Securities and Markets Authority, MiFID II, Article 4 — Definitions — definitions of regulated market, MTF, OTF and trading venue.
- European Securities and Markets Authority, MiFID II, Article 27 — Obligation to execute orders on terms most favourable to the client — best-execution factors, execution policy and transactions outside a trading venue.